Every time your product, price or process changes, the training or welcome video goes stale, and reshooting it takes a whole day. HeyGen's API generates video with a digital twin of a real person from a script, translates videos with lip-sync, and can batch up to 100 requests per call, all from your own system.
Who this is NOT for
This is the developer door: REST, CLI and MCP. If nobody on your team writes code and you do not use an agent like Claude Code, do not start here. It is also not for you if your data and your likeness cannot leave your office: everything runs on HeyGen's cloud, so for something local look at ComfyUI or Remotion. And if you make one video a year, a phone and an afternoon of filming will cost less than integrating an API.
What matters here is not the avatar, it is that the video becomes repeatable: the Miro case on their own page says it all. When the product changes, the same face 're-records' through the API without setting foot in a studio. The usual mistake is thinking the bottleneck is the video, when it is really the script: if you do not have up-to-date scripts today, the API will just produce something outdated faster. Two things you need to check yourself. The page says '30+ languages' in one place and '175+' in another, so test your language pair before promising it to a client. And to create avatars at scale they ask you to upload the person's consent: do not clone anyone's face without their written permission. We could not verify the license or star count; it is a closed commercial service, not an open-source project.
Your first step
Open docs.heygen.com, go to «Pricing» and write down what a 1-minute video would cost you. If the numbers work, get your API key and generate a 30-second welcome video as a test.
The HeyGen API implementation guide
The project belongs to docs.heygen.com and it is free: the link beside asks for nothing. The guide to set it up without getting lost is ours: step by step, common mistakes and a checklist. Leave your email and we will send it.
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